CN112483821A

CN112483821A - Folding portable highway construction measuring device

Info

Publication number: CN112483821A
Application number: CN202011419478.XA
Authority: CN
Inventors: 张天明
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-12-08
Filing date: 2020-12-08
Publication date: 2021-03-12

Abstract

The invention relates to the technical field of highway construction measurement, in particular to a foldable portable highway construction measuring device. The protective support comprises a protective support body, the protective support body comprises a connecting disc, a through groove is formed in the side face of the connecting disc, a rotating shaft is fixed in the through groove, a limiting plate is arranged on the through groove and comprises a clamping plate, the clamping plate is of a straight plate structure, the clamping plate is annularly arrayed on the outer surface of the rotating shaft, a supporting rod is connected to the side face of the connecting disc, protective plates are arranged on two sides of the supporting rod and are of partial cylinder structures, a cylinder is formed by a plurality of protective plates, a rotating hole is formed in the upper portion of the supporting rod, the size of the rotating hole is matched with that of the rotating shaft, the rotating hole is rotatably connected with the rotating shaft, a connecting threaded hole is formed in the upper portion of the rotating hole.

Description

Folding portable highway construction measuring device

Technical Field

The invention relates to the technical field of highway construction measurement, in particular to a foldable portable highway construction measuring device.

Background

The invention aims to provide a foldable portable measuring device for highway construction, which solves the problem that the common bracket can not protect the total station when moving the total station.

Disclosure of Invention

The invention aims to provide a foldable portable measuring device for road construction, which solves the problems in the prior art.

In order to realize the purpose, the portable highway construction measuring device based on folding is provided, which comprises a protective support and a fixing structure, wherein the protective support comprises a connecting disc, a through groove is formed in the side surface of the connecting disc, a rotating shaft is fixed in the through groove, a limiting plate is arranged on the through groove, the rotating shaft comprises a clamping plate, the clamping plate is of a straight plate structure, the clamping plate is annularly arrayed on the outer surface of the rotating shaft, a supporting rod is connected to the side surface of the connecting disc, two sides of the supporting rod are provided with protecting plates, the protecting plates are of partial cylindrical structures, a plurality of protecting plates form a cylindrical barrel, a rotating hole is formed above the supporting rod, the size of the rotating hole is matched with that of the rotating shaft, the rotating hole is rotatably connected with the rotating shaft, a connecting threaded hole is formed above the rotating hole, a connecting bolt is connected in the threaded hole, a hand-screwed nut is arranged above the connecting bolt, a handle is arranged on one side of the supporting rod protruding outwards, the handle is located in the middle of the supporting rod, a threaded sleeve is arranged above the connecting disc, an adjusting structure is arranged above the threaded sleeve, and a total station is fixed on the adjusting structure;

when the protective bracket is used, when needs are measured, it makes it break away from to change the hole and get into in the connecting thread hole to rotate connecting bolt clockwise earlier, then with bracing piece revolute axle downwardly rotating, wait until the angle suitable, the connecting bolt is rotated anticlockwise again and makes connecting bolt get into in the commentaries on classics hole and block the cardboard, makes the bracing piece can't rotate, reaches fixed effect, then places the bracing piece subaerial and can measure according to flow debugging total powerstation again.

The fixed knot structure includes a plurality of lock sleeves, the lock sleeve is connected bracing piece bottom, the lock sleeve is circular-arc structure, the spout has been seted up in the lock sleeve, the spout shape with lock sleeve shape phase-match, the lock sleeve top is equipped with the spread groove, the spread groove with the spout is linked together, be equipped with the locking lever in the spout, the locking lever top is connected with the connecting rod, locking lever sliding connection be in the spout, connecting rod sliding connection be in the spread groove.

Fixed knot constructs when using, when measuring the central line of next section highway promptly, need remove the total powerstation, and it makes it break away from to change the hole and get into in the connecting thread hole to rotate connecting bolt clockwise earlier this moment, upwards rotates the bracing piece again until the bracing piece is restricted by the limiting plate, then in rotatory bracing piece makes its entering into the spout that leans on the right-hand member left, has constituteed the guard plate of drum structure between the guard plate this moment, has protected the total powerstation, makes its injury that the anticollision caused when removing.

As a further improvement of the technical scheme, the adjusting structure comprises a bottom plate, a sleeve is arranged below the bottom plate, a rotary groove is arranged in the sleeve, the size of the rotary groove is larger than the inner diameter size of the sleeve, a lead screw is arranged below the adjusting structure, a rotary plate is arranged above the lead screw, the rotary plate is rotatably connected in the rotary groove, and the lead screw is in threaded connection with the threaded sleeve.

As a further improvement of the technical scheme, the bottom of the screw rod is provided with an adjusting handle, the screw rod is sleeved with a sleeve rod, the adjusting handle is located below the connecting disc, the height of the adjusting structure is increased by rotating the screw rod, so that the height of the total station is adjusted, and meanwhile, the adjusting structure can rotate independently and is convenient to measure through the rotating plate matched with the rotating groove.

As the further improvement of this technical scheme, be equipped with the adjustment disk on the bottom plate, the adjustment disk with the articulated cooperation of bottom plate, set up the regulation screw hole on the bottom plate, it is opposite that the regulation screw hole is located the hinged end, adjust threaded hole and be equipped with the regulation pole, it includes adjusting screw to adjust the pole, adjusting screw with adjust screw hole threaded connection, can be more convenient adjust the lead screw through adjusting handle, the rod cover can adjust the rising position of lead screw in advance and can clean the lead screw surface again, guarantees lead screw pivoted smoothness.

As a further improvement of the technical scheme, a sliding block is arranged above the adjusting screw, a connecting block is arranged below the sliding block, the connecting block is matched with the top end of the adjusting screw in a hinged mode, the adjusting disc is arranged below the adjusting disc, the sliding block is connected in a sliding mode, a hand-screwed nut is arranged below the adjusting screw, the adjusting disc is jacked up to be hinged through the adjusting screw, the angle of the adjusting disc is changed, the situation of pits in the road surface to be constructed is responded, and the calibration burden is reduced.

As a further improvement of the technical scheme, a clamping groove is formed in the adjusting disc, a plurality of positioning grooves are formed in the outer side of the clamping groove, a plurality of fixing threaded holes are formed in the side surface of the adjusting disc, fixing screws are connected with the fixing threaded holes in an internal thread manner, a fixing plate is arranged in the clamping groove, a positioning block is arranged at the edge of the fixing plate, the shape and the size of the positioning block are matched with those of the positioning grooves, a plurality of positioning screw holes are formed in the side surface of the fixing plate, the positioning screw holes are in threaded connection with the fixing threaded holes, the fixing plate is fixed below the total station, the adjusting rod is further connected with the adjusting disc.

As a further improvement of the technical scheme, the left side of the lock rod is provided with an elastic block, the right side in the connecting rod is provided with a clamping groove matched with the elastic block, and the total station is fixed and prevented from falling.

As the further improvement of this technical scheme, the connecting rod top is connected with the pole cap, the size of pole cap is greater than the size of spread groove, the connecting rod with the pole cap is connected the right side that leans on of locking lever, the preferred arc structure of elastic block conveniently withdraws from, uses elastic material as elasticity provider simultaneously, can carry out fixing to a certain extent in getting into the spout, prevents to drop.

As a further improvement of the technical scheme, the bottom of the supporting rod is provided with supporting legs which are fixedly connected to the inner side of the supporting rod, so that the locking rod is conveniently pushed.

As a further improvement of the technical scheme, the thickness of the supporting rod is matched with that of the lock sleeve, the thickness of the supporting rod and the thickness of the lock sleeve form a T-shaped structure, the thickness of the protective plate is smaller than that of the supporting rod, the whole weight is reduced by reducing the thickness of the protective plate, and meanwhile the strength of the protective plate is prompted by the T-shaped structure.

Compared with the prior art, the invention has the beneficial effects that:

1. among this based on folding portable measuring device for highway construction, rotatable bracing piece through setting up, cooperation arc guard plate can form tube-shape protective structure after upwards rotatory, protects the total powerstation of inside, prevents that some little collisions from leading to the fact the harm to the total powerstation when removing, avoids dismantling and adjust the problem of calibration total powerstation, handle plotting efficiency repeatedly simultaneously.

2. Among this based on folding portable measuring device for highway construction, fixed knot through setting up constructs to fixed the guard plate that forms tube-shape protective structure, conveniently carries, and is concrete, upwards rotates when the guard plate and has formed tube-shape protective structure when being restricted by the baffle, through the locking lever in the sliding chute this moment, makes the spout of locking lever and the other end be connected, reaches fixed effect, and tube-shape protective structure is in stable state this moment, can carry through the handle, and is very convenient.

3. Among this based on folding portable measuring device for highway construction, through the connecting bolt cooperation cardboard that sets up, when needs are fixed, twist the bolt downwards and move, make it block each other with the cardboard, then the bracing piece just can not rotate around the pivot again, reaches fixed effect to realize the supporting effect of tripod itself, replaced axis structure in the past simultaneously, reduced holistic volume, conveniently carried.

Drawings

FIG. 1 is a schematic view of the entire structure of embodiment 1;

FIG. 2 is a schematic structural view of the closed protection state of embodiment 1;

FIG. 3 is a schematic diagram showing the whole structure of example 1 in a disassembled state;

FIG. 4 is a schematic view of the elevating structure of embodiment 1;

fig. 5 is a partially disassembled schematic view of the lifting structure of embodiment 1;

FIG. 6 is a schematic diagram showing a disassembled regulating structure of example 1;

FIG. 7 is a schematic sectional view of a part of an adjusting structure in example 1;

FIG. 8 is a schematic view of the structure of a support bar according to embodiment 1;

FIG. 9 is a schematic view of a confinement structure of embodiment 1;

fig. 10 is a schematic view of a fixing structure of embodiment 1.

The various reference numbers in the figures mean:

100. a protective bracket;

110. a connecting disc; 111. connecting grooves; 112. a rotating shaft; 113. clamping a plate; 114. a threaded sleeve; 115. a limiting plate;

120. a support bar; 121. a protection plate; 122. hole turning; 123. connecting the threaded hole; 124. a connecting bolt; 125. screwing the screw cap by hand; 126. a handle;

130. an adjustment structure; 131. a base plate; 132. a sleeve; 133. rotating the groove; 134. adjusting the threaded hole; 135. an adjusting disk; 136. a card slot; 137. positioning a groove; 138. fixing the threaded hole; 139. fixing the screw rod;

140. a screw rod; 141. a rod sleeve; 142. adjusting the handle; 143. rotating the plate;

150. a total station; 151. a fixing plate; 152. positioning blocks; 153. positioning the screw hole;

160. an adjustment structure; 162. adjusting the screw rod; 163. a slider; 164. connecting blocks; 165. screwing the nut by hand; 166. a sliding groove;

170. supporting legs;

200. a fixed structure; 210. a lock sleeve; 211. a chute; 212. connecting grooves;

220. a lock lever; 221. a connecting rod; 222. a rod cap; 223. an elastic block.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

Example 1

Referring to fig. 1 to 10, a foldable portable road construction measuring device is provided, which includes a protective bracket 100 and a fixing structure 200, wherein the protective bracket 100 includes a connecting disc 110, the connecting disc 110 is preferably circular, and is convenient for subsequent formation of a cylindrical protective structure, a through groove 111 is formed in a side surface of the connecting disc 110, a rotating shaft 112 is fixed in the through groove 111, a limiting plate 115 is arranged on the through groove 111, the rotating shaft 112 includes a clamping plate 113, the clamping plate 113 is a straight plate structure, the clamping plate 113 is annularly arrayed on an outer surface of the rotating shaft 112, a support rod 120 is connected to the side surface of the connecting disc 110, two sides of the support rod 120 are provided with protection plates 121, the protection plates 121 are partial cylindrical structures, a plurality of protection plates 121 form a cylinder, a rotating hole 122 is formed above the support rod 120, the size of the rotating hole 122 is matched with the size of the rotating shaft 112, meanwhile, the edge of the clamping plate is designed to be an arc-shaped structure, so that the clamping plate can rotate conveniently and can be prevented from shaking, the rotating hole 122 is connected with the rotating shaft 112 in a rotating manner, a connecting threaded hole 123 is formed above the rotating hole 122, a connecting bolt 124 is connected with the connecting threaded hole 123 in an internal thread manner, the size of the connecting bolt 124 is matched with that of the clamping plate 113, specifically, the radius of the connecting bolt 124 is smaller than the width of the clamping plate 113, so that the clamping plate can be limited conveniently, a hand screw cap 125 is arranged above the connecting bolt 124, a lifting handle 126 is arranged on one side, protruding outwards, of the supporting rod 120, the lifting handle 126 is positioned in the middle of the supporting rod 120, a threaded sleeve 114 is arranged above the connecting plate 110, an adjusting structure 130 is arranged above the threaded sleeve 114, and a total station 150 is fixed on the adjusting structure 130 A mechanical and electrical integrated high-technology measuring instrument is a surveying and mapping instrument system integrating horizontal angle, vertical angle, distance and height difference measuring functions;

the protection support 100 of this embodiment is when using, when needs measure, clockwise rotation connecting bolt 124 makes it break away from and changes hole 122 and get into connecting thread hole 123 earlier, then with bracing piece 120 revolute axle 112 downwardly rotating, it is suitable to wait for the angle, rotate connecting bolt 124 anticlockwise again and make connecting bolt 124 get into and change in the hole 122 and block cardboard 113, make bracing piece 120 unable rotating, reach fixed effect, then place bracing piece 120 subaerial again and can measure according to flow debugging total powerstation.

Fixed knot constructs 200 and includes a plurality of lock sleeves 210, lock sleeve 210 connects in bracing piece 120 bottom, lock sleeve 210 is circular-arc structure, has seted up spout 211 in the lock sleeve 210, spout 211 shape and lock sleeve 210 shape phase-match, lock sleeve 210 top is equipped with connecting groove 212, connecting groove 212 is linked together with spout 211, be equipped with locking lever 220 in the spout 211, locking lever 220 top is connected with connecting rod 221, locking lever 220 sliding connection is in spout 211, connecting rod 221 sliding connection is in connecting groove 212.

When the fixing structure 200 of this embodiment is used, when measuring the central line of next section of highway promptly, need remove the total powerstation, at this moment clockwise rotate connecting bolt 124 earlier and make it break away from to change hole 122 and get into in connecting threaded hole 123, upwards rotate bracing piece 120 again until bracing piece 120 by the restriction of limiting plate 115, then rotate left bracing piece 120 and make it get into in the spout 211 that leans on the right-hand member, the guard plate of drum structure has been constituteed between the guard plate 121 this moment, protect the total powerstation, make its injury that the collision caused when removing.

In addition, regulation structure 130 includes bottom plate 131, bottom plate 131 below is equipped with sleeve 132, be equipped with turn trough 133 in the sleeve 132, the size of turn trough 133 is greater than the internal diameter size of sleeve 132, it is equipped with lead screw 140 to adjust structure 130 below, lead screw 140 top is equipped with commentaries on classics board 143, commentaries on classics board 143 rotates to be connected in turn trough 133, lead screw 140 and thread bush 114 threaded connection, promote the height of regulation structure 130 through rotating lead screw 140, thereby realize adjusting the height of total powerstation 150, simultaneously through changeing board 143 cooperation turn trough 133, make and adjust structure 130 and can independently rotate, convenient the measurement.

Further, the bottom of the screw rod 140 is provided with an adjusting handle 142, the screw rod 140 is sleeved with a sleeve rod 141, the adjusting handle 142 is located below the connecting disc 110, the screw rod can be adjusted more conveniently through the adjusting handle 142, the rod sleeve 141 can not only pre-adjust the lifting position of the screw rod 140, but also clean the surface of the screw rod 140, and the smooth rotation of the screw rod 140 is ensured.

Still further, be equipped with adjustment disk 135 on bottom plate 131, adjustment disk 135 articulates the cooperation with bottom plate 131, seted up on bottom plate 131 and adjusted screw hole 134, adjust screw hole 134 and be located the hinged end face to face, adjust the threaded hole 134 and be equipped with regulation pole 160, adjust pole 160 and include adjusting screw 162, adjusting screw 162 and adjust screw hole 134 threaded connection, jack up articulated adjustment disk 135 through adjusting screw 162, make adjustment disk 135's angle change to deal with the condition of treating construction road surface pothole, reduce the calibration burden.

Specifically, adjusting screw 162 is equipped with slider 163 in the top, and slider 163 below is equipped with connecting block 164, and connecting block 164 and the articulated cooperation in adjusting screw 162 top have been seted up to adjustment disc 135 below sliding tray 166, and slider 163 sliding connection is in sliding tray 166, and adjusting screw 162 below is equipped with hand screw nut 165, further makes adjusting lever 162 be connected with adjustment disc 135, promotes the temperature nature when adjustment disc 135 uses.

In addition, the last draw-in groove 136 of having seted up of adjusting disk 135, a plurality of constant head tank 137 have been seted up in the draw-in groove 136 outside, a plurality of fixed screw hole 138 have been seted up to adjusting disk 135 side, fixed screw hole 138 internal thread is connected with clamping screw 139, be equipped with fixed plate 151 in the draw-in groove 136, fixed plate 151 edge is equipped with locating piece 152, locating piece 152 shape size and constant head tank 137 shape size phase-match, a plurality of location screw 153 have been seted up to fixed plate 151 side,

location screw

153 and 138 threaded connection of fixed screw hole, fixed plate 151 is fixed in total powerstation 150 below, fix total.

Further, locking lever 220 leans on left side to be equipped with elastic block 223, leans on right side in the spout 211 to be equipped with elastic block 223 assorted draw-in groove, and elastic block 233 is the preferred arc structure, conveniently withdraws from, uses elastic material as elasticity provider simultaneously, can carry out fixing to a certain extent in getting into spout 211, prevents to drop.

Still further, a rod cap 222 is connected above the connecting rod 221, the size of the rod cap 222 is larger than that of the connecting groove 212, and the connecting rod 221 and the rod cap 222 are connected to the right side of the locking rod 220, so that the locking rod 220 can be conveniently pushed.

In addition, the bottom of the support bar 120 is provided with a support foot 170, and the support foot 170 is fixedly connected to the inner side of the support bar 120.

In addition, the thickness of the support bar 120 is matched with the thickness of the lock sleeve 210, the support bar and the lock sleeve form a T-shaped structure, the thickness of the protection plate 121 is smaller than that of the support bar 120, the whole weight is reduced by reducing the thickness of the protection plate 121, and meanwhile the strength of the protection plate 121 is prompted through the T-shaped structure.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. Based on folding portable measuring device for highway construction, its characterized in that: the protective device comprises a protective support (100) and a fixed structure (200), wherein the protective support (100) comprises a connecting disc (110), a through groove (111) is formed in the side surface of the connecting disc (110), a rotating shaft (112) is fixed in the through groove (111), a limiting plate (115) is arranged on the through groove (111), the rotating shaft (112) comprises a clamping plate (113), the clamping plate (113) is of a straight plate structure, the clamping plate (113) is annularly arrayed on the outer surface of the rotating shaft (112), a supporting rod (120) is connected to the side surface of the connecting disc (110), protective plates (121) are arranged on two sides of the supporting rod (120), the protective plates (121) are of a partial cylinder structure, a cylinder is formed by the protective plates (121), a rotating hole (122) is formed above the supporting rod (120), the size of the rotating hole (122) is matched with that of the rotating shaft (112), and the rotating hole (122) is rotatably connected with the rotating shaft, a connecting threaded hole (123) is formed above the rotating hole (122), a connecting bolt (124) is connected to the connecting threaded hole (123) in an internal thread mode, the size of the connecting bolt (124) is matched with that of the clamping plate (113), a hand-screwed nut (125) is arranged above the connecting bolt (124), a handle (126) is arranged on one side, protruding outwards, of the supporting rod (120), the handle (126) is located in the middle of the supporting rod (120), a threaded sleeve (114) is arranged above the connecting plate (110), an adjusting structure (130) is arranged above the threaded sleeve (114), and a total station (150) is fixed on the adjusting structure (130);

fixed knot constructs (200) and includes a plurality of lock sleeves (210), lock sleeve (210) are connected bracing piece (120) bottom, lock sleeve (210) are circular-arc structure, spout (211) have been seted up in lock sleeve (210), spout (211) shape with lock sleeve (210) shape phase-match, lock sleeve (210) top is equipped with spread groove (212), spread groove (212) with spout (211) are linked together, be equipped with locking lever (220) in spout (211), locking lever (220) top is connected with connecting rod (221), locking lever (220) sliding connection be in spout (211), connecting rod (221) sliding connection be in spread groove (212).

2. The foldable handheld measuring device for road construction according to claim 1, wherein: adjust structure (130) and include bottom plate (131), bottom plate (131) below is equipped with sleeve (132), be equipped with turn trough (133) in sleeve (132), the size of turn trough (133) is greater than the internal diameter size of sleeve (132), it is equipped with lead screw (140) to adjust structure (130) below, lead screw (140) top is equipped with commentaries on classics board (143), change board (143) and rotate to be connected in turn trough (133), lead screw (140) with thread bush (114) threaded connection.

3. The foldable handheld measuring device for road construction according to claim 2, wherein: the bottom of the screw rod (140) is provided with an adjusting handle (142), the screw rod (140) is sleeved with a sleeve rod (141), and the adjusting handle (142) is positioned below the connecting disc (110).

4. The foldable handheld measuring device for road construction according to claim 1, wherein: adjust structure (130) and include bottom plate (131), be equipped with adjusting disk (135) on bottom plate (131), adjusting disk (135) with bottom plate (131) are articulated to be cooperated, set up on bottom plate (131) and adjust screw hole (134), it is opposite to adjust screw hole (134) to be located the hinged end, it adjusts pole (160) to be equipped with in adjusting screw hole (134), adjust pole (160) including adjusting screw (162), adjusting screw (162) with adjust screw hole (134) threaded connection.

5. The foldable handheld measuring device for road construction according to claim 4, wherein: adjusting screw (162) top is equipped with slider (163), slider (163) below is equipped with connecting block (164), connecting block (164) with adjusting screw (162) top is articulated to be cooperated, sliding tray (166) have been seted up to adjusting disk (135) below, slider (163) sliding connection be in sliding tray (166), adjusting screw (162) below is equipped with hand screw nut (165).

6. The foldable handheld measuring device for road construction according to claim 5, wherein: the electronic total station is characterized in that a clamping groove (136) is formed in the adjusting disc (135), a plurality of positioning grooves (137) are formed in the outer side of the clamping groove (136), a plurality of fixing threaded holes (138) are formed in the side face of the adjusting disc (135), fixing screw rods (139) are connected to the inner threads of the fixing threaded holes (138), a fixing plate (151) is arranged in the clamping groove (136), positioning blocks (152) are arranged on the edge of the fixing plate (151), the shape and the size of the positioning blocks (152) are matched with the shape and the size of the positioning grooves (137), a plurality of positioning screw holes (153) are formed in the side face of the fixing plate (151), the positioning screw holes (153) are in threaded connection with the fixing threaded holes (.

7. The foldable handheld measuring device for road construction according to claim 1, wherein: the left side of the lock rod (220) is provided with an elastic block (223), and the right side of the inside of the connecting rod (221) is provided with a clamping groove matched with the elastic block (223).

8. The foldable handheld measuring device for road construction according to claim 7, wherein: connecting rod (221) top is connected with pole cap (222), the size of pole cap (222) is greater than the size of connecting groove (212), connecting rod (221) with pole cap (222) are connected the right side that leans on of locking lever (220).

9. The foldable handheld measuring device for road construction according to claim 1, wherein: supporting legs (170) are arranged at the bottom of the supporting rod (120), and the supporting legs (170) are fixedly connected to the inner side of the supporting rod (120).

10. The foldable handheld measuring device for road construction according to claim 1, wherein: the thickness of the supporting rod (120) is matched with that of the lock sleeve (210), the supporting rod and the lock sleeve form a T-shaped structure, and the thickness of the protection plate (121) is smaller than that of the supporting rod (120).